Comment by PopAlongKid

The version I installed was under an up-to-date version of Windows 10.

It works OK for http web sites, but for https, it pops up an alert:

Netscape 7.0 and s.yimg.com cannot communicate securely because they have no common encryption algorithms.

(this was for the Yahoo! page, it's the same message for other sites as well). I haven't tried anything else.

I also haven't tried (and don't plan to) using the bundled email client, which was the precursor to Thunderbird.